P. Kameli
Department of physics, Isfahan University of Technology, Isfahan, IRAN
[ 1 ] - Experimental Study on the Magnetomechanical Characteristics of Ni-Mn-Ga Ferromagnetic Shape Memory Alloy Single Crystals
Magnetic shape memory properties of Ni-Mn-Ga single crystals were characterized by measurement of stress-induced martensite reorientation under constant magnetic fields. Also magnetic field-induced strain as a function of the applied magnetic field under different constant compressive stress levels has been investigated. All the experiments were performed at room temperature in which the sample...
[ 2 ] - مطالعه اثر مدت زمان بازپخت بر ویژگیهای ساختاری، مغناطیسی و الکتریکی آلیاژ حافظه‌پذیر فرومغناطیسNi47Mn40Sn13
In this investigation, Ni47Mn40Sn13 ferromagnetic shape memory alloy was prepared by mechanical alloying. The metal powders were ball milled in argon atmosphere for 20 hours. X-ray diffraction pattern confirmed formation of crystalline structure of Heusler alloy. As-milled powder samples were sealed in quartz tubes under high vacuum and subjected to heat treatments at 950°C for different time d...
[ 3 ] - مقایسه ی ویژگیهای مغناطیسی نانو ذرات فریت MnFe2O4 ساخته شده به دو روش تجزیه حرارتی و حلال گرمایی
A comparative study of magnetic properties of MnFe2O4 ferrite nanoparticles prepared by two different methods has been reported. The first sample (S1) was synthesized by thermal decomposition of metal nitrates. And the second sample (S2) was prepared by solvothermal method using Tri-ethylene glycol (TEG). Magnetic hysteresis loops at 300 and 5 K; magnetization and AC susceptibility measurements...
[ 4 ] - ساخت آلیاژ حافظه‌پذیر فرومغناطیسNi50Mn34In16 به روش آلیاژسازی مکانیکی و مطالعه اثر بازپخت بر ویژگیهای ساختاری و مغناطیسی آن
In this research, Ni50Mn34In16 ferromagnetic shape memory alloy has been prepared by mechanical alloying method. XRD patterns of the samples showed that after 10 hours of ball milling, the alloy structure was completely formed and continuing of the milling process led to more fine particle size. Also the role of annealing on improvement of the alloy properties was studied. It was found that the...
[ 5 ] - ساخت و بررسی ویژگیهای ساختاری، مغناطیسی و جذب مایکروویو فریت باریم آلایش یافته با سریوم
In this study the structure, magnetic and microwave absorption properties of cerium (Ce) doped barium hexaferrite with general formulae BaCexFe12-xO19 (x=0.0, 0.05, 0.1, 0.15, 0.2) have been investigated. These samples have been prepared by sol- gel method. Influence of replacing Fe+3 ion by rare- earth Ce+3 ion on the structural, magnetic and microwave absorption properties have been investiga...
[ 6 ] - ساخت و بررسی خواص مغناطیسی نانوذرات فریت منگنزخالص (MnFe2O3) و آلایش داده شده در ماتریس سیلیکا
In this study, the pure manganese ferrite nanoparticles and those dispersed in silica were prepared by the sol-gel method. The average size of particles, which is estimated from Scherrer formula, is about 6 nm for pure sample and 5 nm for silica dispersed sample. The particles size values are in agreement with the TEM results. Results of magnetization measurements showed that these samples hav...
[ 7 ] - مطالعه اثر تهی جا در جایگاه لانتانیوم روی خصوصیات ساختاری، الکتریکی و مغناطیسی ترکیب منگنایت La1-xMnO3+δ، ساخته شده تحت شرایط متفاوت
In this investigation, the effect of Lanthanum vacancy on the structural, electrical and magnetic properties of La1-xMnO3+δ manganite (x=0, 0.05) was studied. Decreasing La3+ amount in samples led to creation of some Mn4+ cations. By increasing the Mn4+content in atomic structure of samples, double exchange interaction was strengthened. Results of Ac magnetic susceptibility measurements indica...
[ 8 ] - تأثیر آلایش نقره بر خواص ساختاری، الکتریکی و مغناطیسی سیم ابررسانای Bi/Ag 2223
In this study, the superconducting properties of Bi-2223/Ag wires, made by the PIT method have been studied. Powder samples were prepared using conventional solid state reaction method. After calcination, samples with different Ag percent (0, 5, 10, 15, 20, and 25) prepared and sintered at 830 °C. It was shown that Ag addition has not only affected the formation of the desired Bi-2223 phase an...
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